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Old 05-16-2009, 11:48 PM   #1
mav1c
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Default What ratio water/coolant do you run? Water Wetter too?

I'll be changing my radiator out pretty soon, and I'm wondering what you track guys run for a water/collant ratio. Currently I'm about 60/40 water/coolant. Not had any problems with the car running hot. When I change out the radiaotr I'm thinking of going to 75/25 and adding a bottle of Water Wetter.
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Old 05-17-2009, 12:12 AM   #2
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That depends. For racing we are not allowed to use coolant. Well at least i know NASA doenst allow it. Coolant on track is dangerous. If you drop coolant on track it will create a slippery surface, which will be catastrophic if trailing cars drive over it. Most racers i know, including me, use distilled water and water wetter. Even if youre just a weekend warrior, you should seriously consider not using coolant for track days for safety.
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Old 05-17-2009, 12:20 AM   #3
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Quote:
Originally Posted by mav1c View Post
I'll be changing my radiator out pretty soon, and I'm wondering what you track guys run for a water/collant ratio. Currently I'm about 60/40 water/coolant. Not had any problems with the car running hot. When I change out the radiaotr I'm thinking of going to 75/25 and adding a bottle of Water Wetter.
50/50 No problems.. I'm sure you know but coolant needs water to lower its freezing point. (you may store your car for winter for all i know... so IDK just tossing that out there)

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That depends. For racing we are not allowed to use coolant. Well at least i know NASA doenst allow it. Coolant on track is dangerous. If you drop coolant on track it will create a slippery surface, which will be catastrophic if trailing cars drive over it. Most racers i know, including me, use distilled water and water wetter. Even if youre just a weekend warrior, you should seriously consider not using coolant for track days for safety.
I've heard about coolant doing this, just never heard of that many people doing only water + water wetter..




**edit**

Oh and in for more info.
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Old 05-17-2009, 01:18 AM   #4
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I think a 75/25 mix might be ideal for a street/track car. Track only.. distilled and water wetter sounds good.

from what i've heard running straight water, will have a lower boiling point and will be harder on your water pump..

it is true that coolant on the track is bad news.. unless you're running some sanctioned group where there are rules like straight water.. you will still have to deal with other cars that could potentially leak coolant on the track.

These cars are very heat sensitive when you start pushing them, and the ambient temps are high. Also might be a good time to go for a lower temp thermostat.
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Old 05-17-2009, 02:21 AM   #5
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for my race car I use 2 bottles of watter wetter and distilled water. unless you're worried about freezing temps, antifreeze or coolant does nothing in helping temps
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Old 05-17-2009, 10:02 AM   #6
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i stick with the 50/50, since i drive in < 0F weather every winter, and i haven't wanted to change my coolant out twice a year. my STi is at stock power, so the cooling isn't really much of an issue on track. but i have definitely considered going to no coolant (or much less) for the safety of others on track. i should be running at least 15 days this year if all goes well...3 down so far.

i want to hear if anyone changes their coolant twice a year to handle both track days and winter. and whether having a more diluted mix really makes much of a difference if it starts dumping on track.
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Old 05-17-2009, 10:22 AM   #7
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50/50. My temps never go over 180 or so on stock STI power. Anti-freeze has both rust inhibitors, lubricants and seal conditioners on it. If you run pure water (I know you might be required to) you're probably looking at premature cooling system issues. I have been considering pure polypropylene glycol instead of standard coolant though. Boils at 360 degrees and should reduce the chance of detonation.
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Old 05-17-2009, 10:48 AM   #8
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I run 50/50 with a bottle of water wetter on my wagon on track. NASA requires racers to run water, but most regions where freezing temps are likely they allow coolant.

For race cars we usually suggest Water + 2 Bottels of Water Wetter + 1 Cup of Coolant. This will provide enough lube, conditioner and rust inhibitors for a race car.

-mike
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Old 05-17-2009, 10:57 AM   #9
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I run water and water wetter.

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Old 05-17-2009, 12:36 PM   #10
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I run 75/25 with a bottle of water wetter and a bottle of the subaru coolant conditioner. I think I may drain it and take the coolant out of the equation completely. Last winter my car sat outside but now it has a spot in a heated garage so I don't have to worry about it freezing next offseason.
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Old 05-17-2009, 12:45 PM   #11
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Quote:
Originally Posted by boost junkie View Post
I run 75/25 with a bottle of water wetter and a bottle of the subaru coolant conditioner. I think I may drain it and take the coolant out of the equation completely. Last winter my car sat outside but now it has a spot in a heated garage so I don't have to worry about it freezing next offseason.
Why do you run the coolant conditioner?

-Duncan
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Old 05-17-2009, 01:15 PM   #12
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Quote:
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Why do you run the coolant conditioner?

-Duncan
It's supposedly makes sure that the seals are in good condition.. or something along those lines. Its recommended at every coolant flush.
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Old 05-17-2009, 01:32 PM   #13
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It's required for older subaru engines. I think it's to seal pinhole head gasket leaks. It's just regular cooling system sealer in a subaru bottle.

Quote:
These cars are very heat sensitive when you start pushing them, and the ambient temps are high. Also might be a good time to go for a lower temp thermostat.
A lower temp 'stat will have no affect on a car that wants to overheat. Once you're beyond the "full open" temp of the 'stat it doesn't matter what temp it opens at. What I mean is, the 'stat has no impact if your cooling system is too small anyway or compromised with a big front mount or something like that. I have a lower temp 'stat and big radiator. My car doesn't tend to overheat so, the 'stat is keeping the temp at 180 or so. I've also reduced the temp the fans come on so, they come on at 190 instead of 200+.

Last edited by MasterKwan; 05-17-2009 at 01:37 PM.
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Old 05-18-2009, 09:17 AM   #14
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95% water 5% WW

its a pure race car that spends the winters in a garage... No coolant ever..
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Old 05-18-2009, 11:33 AM   #15
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50/50 but I'm only a stage II 07 WRX. The car has no cooling issues.
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Old 05-20-2009, 08:38 AM   #16
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I think I'm going to try 75/20/5 Water/Coolant/WW. I still want to keep some antifreeze in the car since it sits in my unheated garage over the winter. So, what coolant do you guys use?
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Old 05-20-2009, 09:52 AM   #17
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+1 for the above-- That what i decided on after running NPG+ for many many years. 75-20-5 working great--oil and water runs cooler then before.
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Old 05-20-2009, 09:55 AM   #18
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You didn't like the NPG+ or was it just cost? I've been thinking about switching to NPG.
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Old 05-20-2009, 11:03 AM   #19
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So the coolant users...what do you use? Just the old Prestone from Pep Boys, or something else?
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Old 05-20-2009, 11:06 AM   #20
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I just used prestone. like a 80- 20 mix. now.
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Old 05-20-2009, 11:12 AM   #21
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All I use is Subaru factory coolant. Other than in emergency's I wouldn't run parts store coolant. There's no standard for coolant like there is for brake or auto transmission fluid so, you don't know if the parts store coolant actually meets all of subaru's requirements. They claim they do but, there's no way to verify it.
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Old 05-20-2009, 11:13 AM   #22
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Anyone used the Motul Mocool?

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Old 05-20-2009, 11:14 AM   #23
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Does it cost $Texas? Since motul fluids have all went up I've been angry.

It's like motul's water wetter?
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Old 05-20-2009, 11:15 AM   #24
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$12 from Mach V. Seems to be the cheapeast I can find. Water wetter is what? $9?
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Old 05-20-2009, 11:18 AM   #25
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I might try this out.. i know more local shops that stock motul then redline.

Nice find.
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